32-bit is a term applied to processors, and computer architectures which manipulate the address and data in 32-bit chunks. It is also a term given to a generation of computers where 32_bit processors were the norm.
The external address and data buses are often wider than 32-bits but both of these are stored and manipulated internally in the processor as 32-bit quantities. For example, the Pentium Pro processor is a 32-bit machine, but the external address bus is 36-bits wide, and the external data bus is 64-bits wide.
In computer architecture, 32-bit is an adjective used to describe integers, memory addresses or other data units that are at most 32bits (4 octets) wide, or to describe CPU and ALU architectures based on registers, address buses, or data buses of that size.
If the base address of all 32-bit segments is set to 0, and segment registers are no more used explicitly, the segmentation can be forgotten and the processor appears as having a simple linear 32-bit address space.
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